Granted Patent
Utility
US 5,253,619 · App. 07/990,777
Hydraulically powered actuator with pneumatic spring and hydraulic latching
Inventors:
William E. Richeson, Frederick L. Erickson
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Dec 9, 1992
Inventors
William E. Richeson
Frederick L. Erickson
Assignee (at issue)
North American Philips Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.